The combination of the Vaisala AVAPS Dropsonde Receiving System and the
Vaisala Dropsonde RD93 offers airborne atmospheric researchers a
complete solution for accurate in-situ measurement of the atmosphere.
The Vaisala Dropsonde RD94 is a general-purpose dropsonde for high-altitude deployment from a variety of aircraft. Slowed in its descent through the atmosphere by a special parachute, the RD94 measures the atmospheric profiles of pressure, temperature, relative humidity and wind from the point of launch to the surface.